Control mechanism



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Patented Nov. 13, 1945 UNITED STATES PATENT. OFFICE CONTRUL MECHANISMWilliam W. Criley, Shaker Heights, Ohio, assignor to The AjaxManufacturing Company, Cleveland, Ohio, a corporation of OhioApplication Marc-h 24, 1942, Serial No. 435,981

7 Claims. (Cl. 1921-139) The present invention relates to an improvedmechanism for effecting the non-repeat operating control of a metalWorking machine such as a. forging machine, forging press and the like.A manual control device such as a foot treadle or hand lever iscustomarily provided for initiating the working stroke or operatingcycle of such a metal working machine, involving the engagement of theclutch and the release of the brake in the machine driving train,Automatic, machinev actuated means are likewise provided on suchmachines for subsequently controlling` the clutch and brakev operationto the end of a single working cycle, It `is highly desirable, not onlyfork the purposes of human safety, but also for the proper operation ofthe metal working machine at the production rate for which it has beendesigned, to provide automatic means for preventing the machine fromrepeating one operating cycle after the other without an interveningmanipulation of thev manual control by the operator. Such a latterautomatic control device has been conveniently termed a nonrepeatcontrol.

In my co-pending application Serial No.

. operation of the machine, directly into the manual control -valvestructure, whereby the nonrepeat control may be applied to the metalworking machine in a convenient and simplied manner.

Briey outlined, the improved structure embodying the principle of myinvention consists of the incorporation of a valve means connected inseries with the manually operated control valve and operated by pressurefrom the clutch pressure actuating line for shutting off and renderinginoperative the manual control valve during each operating cycle, thusrequiring an intervening resetting movement of the manual control valvebefore another working cycle of the machine may be instituted.

To the accomplishment of the foregoing and related ends, said inventionthen comprises the features hereinafter fully described and particularlypointed out in the claims, the following description and; the annexeddrawing setting forth in detail certain illustrative embodiments of theinvention, these being indicative, however, of but a few of the variousways in which the principle of the invention may be employed.

In said annexed drawing- Fig. 1 is an elevational view illustrating thecontrol mechanism embodying the principle of my invention as applied toa metal working machine such as a forging press;

Fig. 2 is a sectional view taken through the manual control valve orfoot treadle, showing the auxiliary non-repeat valve incorporatedtherein; and

Fig. 3 is a view similar to Fig. 2 but showing an alternative formofconstruction for the auxiliary valve proper.

Now referring more particularly to the drawing, Fig. 1 shows the frameof a forging press as indicated at l upon which the electric drive motor2 is mounted and connected by means of a drive belt to the fly wheel ofthe pressure actuated clutch 3 mounted either upon the high speed shaft(as shown in the drawing) or on the main shaft. A pressure actuatedcontrol valve A (alternatively called a timer valve) is adapted toreceive pressure from the main supply line 5` and through theaccumulator tank 6 to control and distribute actuating pressure throughthe clutch control line 'l and the brake control line 8.

A cam 9, mounted upon the main shaft I 0, contacts with the follower Il,and the motion of the latter is transmitted through the push rod l2 tothe control valve 4. These elements constitute the machine actuatedmechanism for controlling the operation of the clutch and brake afterthe operating cycle of the machine has been once instituted.

The above described elements of the mechanism are illustrated anddescribed in detail in my (ro-pending application ,Serial No. 390,092,led. October 24, 1941, and hence need not be here :further described orset forth,

A manual control valve, such as the foot lever indicated generally ati3, is also connected to the main supply line 5 and to the pressureactuated control valve 4 through the line lf3, A line I5 leads from theclutch pressure control line 1 to the foot treaolle i3.

The operating parts of the foot treadle valve or manual control valveare shown in Fig. 2. The main pressure supply line 5 (which may be fromthe shop air pressure line) enters the intake chamber 20. The outletport 2l leads from the chamber 28 to the passage 23 and is adapted to beopened and closed by the spring loaded poppet valve 22. The passage 23leads to the second valve chamber 24 having an exhaust outlet thereinwhich is opened and closed by the spring loaded poppet valve 26. Thepassage 21 places the. exhaust outlet 25 incommunication with theatmosphere,

The valve chamber 24 is in communication with the inlet passage 28leading to the cylindrical bore 29 in which the sliding piston, ordumbbell type valve 30 is reciprocably mounted.

The bore 29 is located in the block or 'casting 3| attached to the baseplate I3 of the foot treadle structure. The casting or housing 32,containing the poppet valves 22 and 26 and their pertinent parts, isfitted upon and attached to the casting 3I by means of `the studs asindicated at 33 and the gasket 34.

An outlet port 35, in registry with the inlet 28, leads to the conduitor line I4 going to the pressure actuated control valve or timer 4. Abranch passage 3,6 leads from the port 35 to the second port 31inregistry with the exhaust port 38 which communicates with the exhaustoutlet 39 leading to the atmosphere. A reduced diameter portion 40 onthe valve 36 is adapted to place the ports 28 and 35 in registry whenthe piston valve 30 is in its lowermost lposition as indicated by thedotted lines in Fig. 2. Another reduced diameter portion 4I places theports 31 and 38 in communication when the piston valve 30 is in its'uppermost position as shown by the full lines inFig. 2. A passage 42leads fromthe clutch pressure control line I to the bottom, closed endof the bore 29.

The upper end of the piston valve 30 has a shoulder 43 which is adaptedto contact with a stop plate 44, thus limiting upward movement of thevalve 3U.

A manipulatinglever in the form of the foot treadle 45 is oscillatablymounted upon the fulcrum pin 4B. The lower or right-hand end 41 ofthefoot treadle 45 consists 0f a foot plate adapted to be stepped upon anddepressed by the operators foot, into the position as shown in Fig. 2.

The upper or left-hand end 48 of the foot treadle 45 is in the form of arocker arm adapted to contact with the upperv end of the piston valve30.

The foot treadle 45 also has a projecting lug 49 adapted to contact withthe valve trip bar 50 which is pivoted on the pin 5I, and in itsalternative positions of movement, adapted to trip or open the poppetvalves 22 and 26, respectively.

VA coil compression spring 52 bearing against the lower end of the tripbar 50, and held in place by the guide stud 53, urges the trip bar in acounter-clockwise direction and with sutcient force to open the poppetvalve 26. A return spring (not shown) is provided for urging the foottreadle in a counter-clockwise direction and into such positioncorresponding to a release of oot'pressure upon the foot plate 41.

The operation of the above described mechanism-is as follows:

In order to start the machine upon its Working cycle, the operatordepresses the foot plate 41 to the position as shown in Fig. 2. Thisopens the valve 22 permitting pressure from the line 5 to be transmittedto the inlet 28 of the valve 30 which is in the position as shown by thedotted lines. Such pressure is then communicated through the outlet port35 to the line I4 to actuate the timer valve 4 which in turn admitspressure from the accumulator tank 6 to the clutch and brake lines 1 and8; whereupon the brake is released and the clutch v3 engaged causing themachine to start upon its working stroke. The cam 9, by cooperation withthe follower Il and push `rod I2, then controls the operation of thetimer valve 4 and the admission of pressure to the clutch and brakelines 1 and 8, respectively, during the remainder of the working cycleof the machine.

When pressure is admitted to the clutch pressure line 1, it is alsotransmitted through the line I5 to the passage 42 to the bottom end ofthe piston valve 36, forcing the latter to its upper position in thebore 29, as shown by the full lines in Fig. 2. When the valve is in thislatter position, the inlet port 28 is closed and the port 31 is openedto the exhaust port 39, thus exhausting any pressure in the line I4leading to the timer valve 4 and preventing pressure actuation of thelatter. Accordingly, in order for the operator to again start themachine on a working cycle, it is necessary to release foot pressureupon the foot treadle 45 and permit the latter to rotate in acounter-clockwise direction, whereupon the rocker arm 48 moves downagainst the upper end of the valve 30, resetting the latter to itsoriginal starting position as shown by the dotted lines.

It will thus be seen that the above described mechanism and its mode ofoperation 'requires the operator to manipulate or release his footpressure upon the foot treadle valve lever 45 at the end of each workingcycle of the machine before it can be started on another one.

In theform of construction shown in Fig. 3, a hollow, ported-wall,piston valve is used in place of the previously described solid ordumb-bell form of piston valve. Thus, in Fig. 3 the main pressure supplyline 5, just as in the form of Fig. 2, is similarly connected to theintake chamber 20 in which the valve 22 is mounted. The hollow, slidingpiston valve 6l hasV an enlarged head or piston B2 on its lower end, andthe passage 63 leads from the clutch control pressure line I5 to thehead end of the cylinder in which such piston 62 is'iitted. The hollowpiston valve 6I has the spaced wall ports V64 and 65, which, when thevalve 6I is in lowermost position, are adapted to place the intake port28 and the outlet port 69 in communication with the line I4 leading tothe timer valve 4. In the lower portion of thevalve 6I are located thespaced wall ports 61 and 68, which, when the valve 6I is in the positionas shown in Fig. 3, are adapted to place the port 69 in communicationwith the` exhaust port 670 leading to the atmosphere.

Leather or ber washers 18`and 1l, lcompressibly held in place by thecompression spring 12,

are mounted between the outer wall of the' valve Gland inner wall .ofthe housing 3i for slidably sealing the valve 5I and the ports d4 and 55in their alternative operating positions. A similar washer is provided,as indicated at 13, for the ports 61 and 68.

The operation of the last described alternative structure of Fig. 3 isthe same as that previously recited in connection with Fig. 2; pressurefrom the line I5 causing the valve 6l to be moved into an upwardposition andrequiring 'a release or resetting movement of the foottreadle 45 to move the valve 6l into downward position before themachine can again be started.

Other modes of applying the principle of the invention maybe employed,change being made as regards the details described, provided thefeatures stated in any of the following claims' or the equivalent ofsuch be employed.

I therefore particularly point out and distinctly claim as my invention:

1. A control mechanism for a metal working machine in which machinethere are present a pressure actuated clutch for engaging the drivingtrain of said machine, a pressure actuated valve for introducingpressure to said clutch, and machine actuated mechanism for closing saidpressure actuated valve after one cycle of operation of said machine,the improvement comprising a unitary, combined manually actuated andpressure actuated control valve for controlling the introduction ofpressure to said pressure actuated valve, said control valve beingmanually operable to introduce pressure to said pressure actuated valve,and pressure actuated to shutoff pressure to said pressure actuatedvalve, and means connecting pressure introduced to said clutch to saidcontrol valve.

2. In a control mechanism for a metal working machine in which machinethere are present a pressure actuated clutch for engaging the drivemechanism of said machine, a pressure supply source, a manual valveconnected to said supply source for controlling the introduction ofpressure to said clutch, machine actuated mechanism for disconnectingthe introduction of pressure to said clutch, the improvement comprisinga pressure actuated valve operable to shut off pressure from said manualvalve to said clutch, and a conduit communicating the pressureintroduced to said clutch to said pressure actuated valve.

3. A control mechanism for a iiuid operated device comprising a manuallyactuated first valve means for controlling the introduction of pressurealternately to an outlet and to an exhaust and a pressure pistonactuated valve connected in series with said first valve means, meansfor introducing pressure from the uid operated device against the pistonof said piston actuated valve to move it to closed position, and meansconnecting the other end of said piston actuated valve to themanipulating movement of said first valve means to move said pistonvalve to open position.

4. In a control mechanism for a fluid operated device comprising amanual valve, a pressure piston actuated valve connected in series withsaid manual valve, a conduit connecting pressure from the fluid operateddevice against the piston of said piston actuated valve to move thelatter to closed position, and means connecting the other end of saidpiston actuated valve to the manipulating movement of saidmanual valveto move said piston actuated valve to open position.

5. A control mechanism for a fluid operated kdevice comprising amanually operated valve body having a dual set of valves mountedtherein, each of said valves having an inlet, an outlet and an exhaust,the inlet of one of said valves being connected to a supply source, theinlet of the other of said valves being connected to the outlet of saidone of said valves, the outlet of said other of said valves beingconnected to the fluid operated device, an oscillatable lever movable inone direction to open said first inlet and movable in the oppositedirection to open said second outlet and simultaneously to open theexhaust on said one of said valves, and pressure actuated meansconnected to the fluid operated device for moving said other of saidvalves to a position closing its inlet and opening its exhaust.

6. A control mechanism for a fluid operated device comprising a manuallyactuated rst valve means for controlling the introduction of pressurefrom a supply source alternately to an outlet and to an exhaust, and apressure actuated second valve means alternately connecting anddisconnecting the outlet of said first valve means with the fluidoperated device, said second valve means being-movable in one directionsolely by pressure educed from the iiuid operated device to sodisconnect the outlet of said first valve means, and mechanicalconnecting means between said rst valve means and said second valvemeans for moving the latter to so connect the Outlet of said first valvemeans.

7. A control mechanism for a fluid operated device comprising a firstvalve means having aA supply port, an outlet port, and an exhaust portand being operable between a rst position connecting said outlet andsaid exhaust ports and a second position connecting said outlet and saidsupply ports, a second valve means having an inlet port, a service port,and a vent port and movable between a first position connecting saidservice and said inlet ports and a second position connecting saidservice and said vent ports, the outlet port of said first valve meansbeing connected to the inlet port of said second valve means, and theservice port of said second valve means being adapted to be connected tothe fluid operated device, manually actuated means for operating saidrst valve means, fluid actuated means for moving said second valve meansto its said second position, and means connected to said manuallyactuated means for moving said second valve means to its said rstposition when said first valve means is operated to its said firstposition.

WILLIAM W. CRILEY.

